Staged Oxidant Burner Layout for Flame and NOx Control
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Solution Overview
Problem
Existing burners for industrial melting furnaces face limitations in flame adjustment range, flame length and coverage, atmosphere control, and NOx emissions, with complex control processes and high oxygen and fuel ejection speeds required for efficient combustion.
Innovation Solution
A burner design with a primary, secondary, and tertiary oxidant delivery components, allowing for flexible adjustment of flame position, speed, and atmosphere, with independent oxidant flow control and staged combustion to reduce NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a typical staged burner with fuel channel and oxidant channel is used, then oxygen staging can delay combustion and produce flat flame zones, but flexible adjustment of oxygen distribution and flame shape is very difficult
Solution Approach 1:
The oxidant delivery system is segmented into multiple independent oxidant delivery components (primary, secondary, tertiary), each with independent flow control. This segmentation allows flexible adjustment of oxygen distribution at different stages of combustion, enabling independent control of flame shape and position without requiring complex structural modifications to the entire burner system.
2Adaptability or versatility
If double-staged oxygen-fuel burner with central and annular conduits is used, then staged combustion can be achieved, but adjustment of atmosphere at surface of melting raw material is limited and flame adjustment range is restricted
Solution Approach 1:
Each oxidant delivery component is equipped with independent flow control mechanisms, making the oxidant distribution dynamic and adjustable. This allows the burner to adaptively control the atmosphere at the melting raw material surface and adjust flame position and shape according to different process requirements, transforming a static conduit configuration into a dynamic control system.
3Temperature
If dilute oxygen combustion with independent ejection outlets is used, then local high-temperature points can be avoided and uniform temperature distribution can be produced, but ejection speeds must be extremely high and control process becomes complex
Solution Approach 1:
The combustion process is segmented into three distinct stages with separate oxidant delivery components, allowing temperature control at each stage. This segmentation enables uniform temperature distribution by preventing local high-temperature points while using simpler flow control mechanisms for each stage, reducing the overall control complexity compared to high-speed ejection systems.
4Object-generated harmful factors
If multi-stage oxidant delivery components with independent flow control are used, then broader flame adjustment and lower NOx emissions can be achieved, but device structure becomes more complex
Solution Approach 1:
The oxidant delivery system is divided into three independent components that enable staged combustion, allowing the fuel-rich flame to be separated from the oxidant introduction zones. This segmentation inherently reduces NOx emissions by preventing premature mixing and maintaining lower combustion temperatures in early stages, while the modular structure makes the complexity manageable through standardized components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The burner achieves broader flame adjustment, lower NOx emissions, improved heat transfer efficiency, and enhanced control over furnace atmosphere, reducing local overheating and improving product quality.
Implementation Method 1
a fuel for flowing through, one end of which is provided with a fuel nozzle; and at least one primary oxidant supply channel for a primary oxidant to flow through
Implementation Method 2
supplying a secondary oxidant through the secondary oxidant delivery component, so that the primary mixture and secondary oxidant come into contact and mix with each other at a set position so as to burn to produce a secondary mixture
Data Source
Figure 1A~2
Figure 3~5
Figure 6A~8
AI summary
Disclosed are a combustor for fuel combustion and a combustion method therefor. The combustor comprises a primary oxidant-fuel delivery assembly, a secondary oxidant delivery assembly, and a tertiary oxidant delivery assembly. The secondary oxidant delivery assembly and the tertiary oxidant delivery assembly are provided on the same side of the primary oxidant-fuel delivery assembly, and the secondary oxidant delivery assembly is located between the tertiary oxidant delivery assembly and the primary oxidant-fuel delivery assembly. The present invention combines the staged combustion and dilution combustion technologies, such that the combustor has a wide flame adjusting range, realizing adjustment of the flame combustion position, flame speed range, flame local atmosphere and flame length, effectively reducing the generation of NOx, and also achieving high heat transfer efficiency.